3986381 has 16 divisors (see below), whose sum is σ = 4878720. Its totient is φ = 3179520.

The previous prime is 3986377. The next prime is 3986393. The reversal of 3986381 is 1836893.

It is a cyclic number.

It is not a de Polignac number, because 3986381 - 2² = 3986377 is a prime.

It is a super-2 number, since 2×3986381² = 31782466954322, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3986351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16421 + ... + 16661.

It is an arithmetic number, because the mean of its divisors is an integer number (304920).

Almost surely, 2^3986381 is an apocalyptic number.

It is an amenable number.

3986381 is a deficient number, since it is larger than the sum of its proper divisors (892339).

3986381 is a wasteful number, since it uses less digits than its factorization.

3986381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

The product of its digits is 31104, while the sum is 38.

The square root of 3986381 is about 1996.5923469752. The cubic root of 3986381 is about 158.5597435552.

The spelling of 3986381 in words is "three million, nine hundred eighty-six thousand, three hundred eighty-one".